Section 29(4) in The Delhi Metro Airport Express Line, General Rules, 2010
(4)(i)Failure of brakes to apply or to release shall be indicated on the Train Control and Monitoring System panel, if brakes fail to apply upto a maximum of any two cars, passengers must be detrained at the next station and the train worked to depot at a speed not exceeding twenty five kilometer per hour;(ii)if brakes fail to apply on more than two cars, the train shall be brought to a stop as soon as possible by application of the emergency brake and shall not proceed until authorised by a competent person from the Rolling Stock Maintenance department;(iii)if brakes fail to release on up to a maximum of any two cars, the brakes shall be isolated on the affected cars; the brakes released by local control; passengers shall be detrained at the next station and, the train worked to depot at a speed not exceeding twenty five kilometer per hour;(iv)if brakes fail to release on more than two cars no attempt shall be made to move the train until authorised by a competent person from the Rolling Stock Maintenance Department.
